Special counsel Robert Mueller’s investigation into alleged Russian meddling in the 2016 election has netted its first prison sentence. Alex van der Zwaan, who worked with Donald Trump’s former campaign chair Paul Manafort and his aide Richard Gates, was sentenced Tuesday to 30 days in prison and fined $20,000 on charges of lying to the FBI. Van der Zwaan is a Belgian-born Dutch attorney who’s married to the daughter of a powerful Russian billionaire. He was charged after he failed to disclose details to the FBI about work he did on behalf of a pro-Russia Ukrainian political party.